Recently, some friends asked me how to use RSI to judge market conditions, so I decided to organize my own understanding and share it with everyone.

RSI is actually an indicator that measures the strength of upward and downward momentum over a period of time. Values between 0 and 100 can tell you whether the market is currently in a bullish or bearish trend. After using it for many years, I find two main practical applications: one is to observe overbought and oversold zones, and the other is to catch divergence signals.

Speaking of overbought and oversold, the logic is straightforward. When RSI exceeds 70, it indicates the market might be overly optimistic, and a pullback risk should be considered; conversely, when RSI drops below 30, it suggests the market is overly pessimistic, and a rebound could be imminent. But I want to emphasize that overbought and oversold only indicate that the market's short-term reaction is excessive, not that the price will immediately reverse. Many beginners fall into this trap.

Regarding RSI parameters, I’ve noticed many people use the default 14, but in reality, the choice of parameters greatly impacts trading results. I adjust mine based on trading cycles: for short-term trading, I use RSI 6, which reacts quickly and generates signals more frequently, but also false signals; for medium to long-term swing trading, I stick with the default RSI 14, which balances accuracy and sensitivity well; for analyzing trends on daily charts or higher, I switch to RSI 24, making the indicator more sluggish, reducing false signals significantly, but also decreasing entry opportunities. Honestly, there’s no absolute best RSI parameter; the key is to find settings that suit your trading style.

Divergence is another signal I frequently use. Simply put, it occurs when the price makes a new high but RSI doesn’t follow suit, or the price hits a new low but RSI doesn’t break the previous low. This suggests the market’s momentum may be weakening. Bear divergence usually indicates waning upward strength, while bullish divergence can signal a potential rebound. However, be aware that divergence doesn’t necessarily mean a trend reversal. My approach is to consider reducing positions or risk after spotting divergence, and to confirm with other indicators or candlestick patterns before entering a trade.

The most common pitfall when using RSI is being fooled by false signals in strong trending markets. For example, during a strong rally, RSI might soar above 80, and many traders see this as overbought and try to short, but the price continues to rise, leading to losses. My experience is that in a strong trend, don’t rely solely on one signal; always check multiple timeframes for confirmation.

Another common mistake is ignoring the differences in timeframes. Some see RSI on a 15-minute chart indicating oversold and want to go long, but overlook that the daily RSI has already fallen below the 50 midline. As a result, the smaller timeframe signal is suppressed by the larger trend, leading to losses. Now, I prefer to confirm the larger timeframe trend first, then look for entry points on smaller timeframes.

Ultimately, RSI is just a tool to help you determine whether the market is overreacting or if momentum can keep pace with price. It’s not foolproof. Currently, I use RSI together with MACD, moving averages, or candlestick patterns, which greatly improves the win rate. Especially when you’re still testing suitable RSI parameters, never rely on a single indicator to make impulsive trades—that’s a painful lesson.

In summary, RSI is a quick-to-learn, practical indicator, especially suitable for beginners. But to truly master it, you need to spend time testing different RSI settings to find the most suitable configuration for your trading cycle and style, then combine it with other tools to form a complete trading system. Only then can you trade more steadily in the market.